All dead but one!

MochiGuu

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Not a happy new year for us :(

Some 3 hours ago I've returned from a 14 day vacation at my mom's. My pets had been in my very animal-loving friend's care. I'd explained to her how to feed the axolotls. Tonight I returned to find 6 out of 7 dead. They had been healthy and fluffy-gilled when I left. They still looked well-nourished but their gills had almost completely gone, they were pale, the skin peeling, they were stiff, but sat on the sand as if they were alive. The temperature was 15° Celsius; the local temp in town was between 12 and 19 degrees according to the internet during my absence.

Only the tiny one I had isolated in a basket with only small holes to allow for minimal water circulation has survived and is active and looks very well. I guess the limited flow is what saved him from whatever contaminant did this.
What stood out were the dead ones' red extremities. No injuries, though loss of skin which I guess was post-mortem however.

A few days ago she told me the water was too murky to see through but all were alive and well as far as she could see. I didn't know what could cause the murkiness but as I had left a newly cleaned filter and fat axolotls, and was 2 days from returning, I guessed they'll be fine. Now I found them dead. There couldn't have been any critical overfeeding judging by what's left. The biggest mystery, but likely also clue, is the good state of the little survivor.

I can't really test the water now as all results will be catastrophic due to 6 axolotls rotting in there. The fish are also dead, only the snails lived but I'm leaving them for dead as they are probably contaminated :( The filter, an external canister, was hot and noisy and seemed to have little to no circulation. But some dirt shouldn't kill them all so fast??

Do you have any theories? I have pictures on request as it's a truly sad sight.
 
Are these adult axolotls? How big was the tank? Exactly what care did your friend give them while you were gone?

Pictures would be helpful.
 
I had instructed her to feed them some pellets (no specific amount, just enough for them to eat in a reasonable amount of time, and only every other or third day), except the surviving one who was to get a small meal worm once or twice daily as he is very little and I wanted to feed him more so he'd grow enough to rejoin the others - good thing he wasn't big enough to be in there with them :( Other than that, just to keep an eye on the temperature so it won't rise too high.

They were almost 20 centimeters in length, the tank is some 280 liters.
 

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I'm sorry for your loss.

It was most likely a built up of ammonia, nitrites, and/or nitrates. Ammonia causes red skin and peeling. I don't think we need to see pictures.

If "the water was too murky to see through" this should have beena big clue that some cleaning was needed.
Did your friend change any water in 14 days?
How big were your axies and how big is your tank?
It sounds like your filter failed or got clogged - mine got clogged with baby snails once - and so no mechanical or biological filtration was occurring. This would have resulted in the build up of waste and poop. Axies produce a lot of waste, hence the need to change water far more frequently than fish tanks.

Keep your little one in a small plastic tub, change the water daily, scrub you tank out and re-cycle it before putting him back.
 
The red on the Leucistics implies ammonia burns. Perhaps one died, clouding/poluting the water and spoking ammonia that hurt the others?
 
So sorry for you loss......hope the little one continues to thrive.
 
I had left a newly cleaned filter and fat axolotls...
The filter, an external canister, was hot and noisy and seemed to have little to no circulation.

How clean is clean? Could you have accidentally wiped out your cycle during cleaning?

If the canister was hot and noisy, it could have been an issue with priming or there was air left in it after the cleaning. This could have drastically reduced its efficiency and possibly crashed your cycle.

Last thing, did your friend do any water changes in that two weeks? With 6 axolotls in a 280l (75g) tank that is a lot of waste which would accumulate fast.

The peeling skin indicates poor water quality.

Edit: auntiejude beat me to a lot of these.
 
She only changed a bit of water (or at least I told her to) when she informed me of the sudden pollution. The filter was running fine when I left. The skin could have started peeling after they died. Whatever the case, I managed to save the little one I loved most and who'd been through so much already. He's only alive today because the cat had ripped his guts out 3 months ago and when he got out of the fridge, he was behind on his growth and the others too big, so I had to put him in a separate compartment in the tank where not enough of the polluted water could flow through to harm him. If he'd never been hurt, he'd died with the others.
 
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